重磁多参数模拟技术及其应用——以黄桥地区LJ线处理解释为例
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摘要
重磁资料解释的精度在很大程度上依赖于地质体物性参数的正确性和构造几何形态的合理性。在实测岩石标本物性资料有限的区域,采用重磁震联合的重磁多参数模拟技术可以提高重磁资料解释的精度。方法的基本原理是:根据地震资料的解释层位建立地质体初始空间结构;通过地震波速度与地层密度的关系式求取空间密度;结合磁源深度估算方法判定火成岩的赋存与磁性基底的起伏;采用重磁多参数复合物理量模型拟合技术,通过不同物理量的拟合,调整模型地质体的密度差、磁化率差和边界,确定地质构造及其属性细节。利用该方法对黄桥地区LJ线进行了重磁观测场、高频滤波场、低频滤波场、带通滤波场、导数、梯度等物理量的一体化拟合,大大地约束了解的范围,提高了重磁资料解释的精度和可信度。
The precision of gravity and magnetic data interpretation de- pends,to a great extent,on the validity of physical properties and the rationality of structure's geometric shape.In the area with lim- ited rock samples,gravity-magnetic-seismic multi-parameter simu- lation technology can be adopted to improve the interpretation accu- racy of gravity-magnetic data.The principles of the technology are as follows:①the initial space structure of geologic model is estab- lished by horizons interpreted for seismic profiles;②the spatial density is obtained by the equation of seismic wave velocity and for- mation density;③the occurrence of igneous rock and the fluctua- tion of magnetic basement are judged by magnetic source depth es- timating method;④by fitting different physical elements,the gravity-magnetic multi-parameter simulation technology is used to adjust the density difference,magnetic capacity difference,and boundary of modeling geologic body and to identify the geologic structures as well as its attributes details.The method was used to do integrated fitting of physical elements of LJ line in Hnangqiao area,including gravity-magnetic observation field,high-frequency filtering field,low-frequency filtering field,pass-frequency filtering field,derivative and gradient,etc.The fitting greatly restricted the range of solutions and improved the accuracy and credibility of gravity-magnetic data interpretation.
The precision of gravity and magnetic data interpretation de- pends,to a great extent,on the validity of physical properties and the rationality of structure's geometric shape.In the area with lim- ited rock samples,gravity-magnetic-seismic multi-parameter simu- lation technology can be adopted to improve the interpretation accu- racy of gravity-magnetic data.The principles of the technology are as follows:①the initial space structure of geologic model is estab- lished by horizons interpreted for seismic profiles;②the spatial density is obtained by the equation of seismic wave velocity and for- mation density;③the occurrence of igneous rock and the fluctua- tion of magnetic basement are judged by magnetic source depth es- timating method;④by fitting different physical elements,the gravity-magnetic multi-parameter simulation technology is used to adjust the density difference,magnetic capacity difference,and boundary of modeling geologic body and to identify the geologic structures as well as its attributes details.The method was used to do integrated fitting of physical elements of LJ line in Hnangqiao area,including gravity-magnetic observation field,high-frequency filtering field,low-frequency filtering field,pass-frequency filtering field,derivative and gradient,etc.The fitting greatly restricted the range of solutions and improved the accuracy and credibility of gravity-magnetic data interpretation.
引文
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2 Li X.On the use of different methods for estimating magnetic depth[J],The Leading Edge,2003,22(3): 1090～1099
3陈沪生，张永鸿，徐师文，等．下扬子及邻区岩石圈结构??构造特征与油气资源评价[M]．北京：地质出版社，1999．1～274
4 Jessell M.Three-dimension geological modeling of po- tentional-field data[J].Computers & Geosciences, 2001,27(4):.455～465
5胡德昭，徐鸣洁，黄钟瑾，太湖地区重磁场特征的地质意义和油气构造研究[J]．南京大学学报，1996，32(1)：90～99
6长春地质学院重力教研室．重力勘探[M]．北京：地质出版社，1980．1～318
7萧敬涌，周国藩．重力勘探资料解释手册[M]．北京：地质出版社，1983．1～475
8邓荣来，李庆浩，宋桂桥，等．重磁联合反演及重磁与MT综合解释巴彦浩特盆地火成岩[J]．石油物探，2002，41(2)：222～225
9黎益仕，殷秀华，刘占坡．对应分析约束下的重磁联合反演及其在塔里木盆地的应用[J]．地震地质，1996，18 (4)：361～367
10刘天佑，崔宁，邱绳德，等．高精度重磁测量弱信号分析及其在塔北雅克拉地区的应用[J]．石油物探，1996，35 (2)：81～88
11林振民，刘斌．二度体重力人机结合选择法程序[J]．物化探计算技术，1986，8(增刊)：1～4
12刘斌．二度半体人机结合选择法程序[J]．物化探计算技术，1986，8(增刊)：12～14
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